On Tuesday Sweden’s centre-left Prime Minister Stefan Lofven, who has been in office since 2014, lost a confidence vote that forces him to step down and will usher in weeks of political uncertainty.

The move came two weeks after an election that saw the anti-immigrant Sweden Democrats, a party with roots in neo-Nazism, make considerable gains as Europe’s migrant crisis continues.

Lofven will continue in a caretaker role until a new government can be formed. In theory he himself can be re-chosen as the next prime minister, but that seems unlikely as his rivals have indicated they won’t vote for him.

Why has normally stable Sweden suddenly descended into political crisis?

Where did this start?

The election has seen Lofven’s Social Democratic Party lose its majority in parliament, after conceding considerable ground to the nationalistic Sweden Democrats.

Europe’s refugee crisis has had a huge impact on a country that was having its first national vote since taking in a record 163,000 migrants in 2015. Sweden has a population of just 10 million.

Lofven’s government had, in recent years, moved to restrict immigration and assuage rising public anger, but apparently such moves were not enough to persuade voters that his administration was doing enough to stem the foreign influx.

Enter the Sweden Democrats, who want the country to take refugees solely from neighbouring Denmark, Finland and Norway (which aren’t exactly overflowing with asylum seekers).

So, voters moved to the right?